438 Workflow Introspection 60b0c15f

List and Inspect Workflows

Use DBOS.list_workflows() to query workflows by status, name, queue, or other criteria.

Incorrect (loading unnecessary data):

# Loading inputs/outputs when not needed is slow
workflows = DBOS.list_workflows(status="PENDING")
for w in workflows:
    print(w.workflow_id)  # Only using ID

Correct (optimize with load flags):

# Disable loading inputs/outputs for better performance
workflows = DBOS.list_workflows(
    status="PENDING",
    load_input=False,
    load_output=False
)
for w in workflows:
    print(f"{w.workflow_id}: {w.status}")

Common queries:

# Find failed workflows
failed = DBOS.list_workflows(status="ERROR", limit=100)

# Find workflows by name
processing = DBOS.list_workflows(
    name="process_task",
    status=["PENDING", "ENQUEUED"]
)

# Find workflows on a specific queue
queued = DBOS.list_workflows(queue_name="high_priority")

# Only queued workflows (shortcut)
queued = DBOS.list_queued_workflows(queue_name="task_queue")

# Find old version workflows for blue-green deploys
old = DBOS.list_workflows(
    app_version="1.0.0",
    status=["PENDING", "ENQUEUED"]
)

# Get workflow steps
steps = DBOS.list_workflow_steps(workflow_id)
for step in steps:
    print(f"Step {step['function_id']}: {step['function_name']}")

WorkflowStatus fields: workflow_id, status, name, queue_name, created_at, input, output, error

Status values: ENQUEUED, PENDING, SUCCESS, ERROR, CANCELLED, MAX_RECOVERY_ATTEMPTS_EXCEEDED

Reference: Workflow Management